removed the qt gui from sflphone

src/gui/official/images/mute_on.png

src/gui/official/images/network.png

src/gui/official/images/ok_off.png

src/gui/official/images/ok_on.png

src/gui/official/images/overscreen.png

src/gui/official/images/preferences.png

src/gui/official/images/screen_main.png

src/gui/official/images/setup_off.png

src/gui/official/images/setup_on.png

src/gui/official/images/sfl-logo.png

src/gui/official/images/sflphone_logo.png

src/gui/official/images/signalisations.png

src/gui/official/images/slider.png

src/gui/official/images/transfer_off.png

src/gui/official/images/transfer_on.png

src/gui/official/images/tray-icon.png

src/gui/official/images/video.png

src/gui/official/images/voicemail_off.png

src/gui/official/images/voicemail_on.png

src/gui/official/images/volume.png